WP Newsletter Builder, the Alley-maintained plugin, models newsletters as a Gutenberg-authored custom post type. Newsletter content is composed from a dedicated block set: a subject block, header, ad blocks, post-list blocks and custom layout blocks. Each newsletter post carries postmeta for template selection, sender list and send-to-ESP routing.

The plugin's admin focuses on authoring inside the block editor and connecting to Campaign Monitor or the configured ESP. It does not aggregate newsletters by status, surface a template usage chart or trend editorial cadence over time. Editorial leads who want to know "how many newsletters shipped this quarter and which template is doing the work" have no chart to look at.

SleekView Charts reads the newsletter CPT and its postmeta directly. A Number card counts total published newsletters. A Pie splits newsletters by status (draft, scheduled, sent). A Bar ranks templates by usage. An Area trends post_date per day so editorial cadence becomes a curve rather than a per-post inspection.

WP Newsletter Builder, used heavily by publishers, ships an excellent Gutenberg authoring surface and a serious ESP routing pipeline, but it is authoring-first by design. Editorial leads who need to know how many newsletters shipped, which template is doing the work and whether the cadence is holding are stuck inspecting the post list. SleekView Charts reads the same CPT and postmeta the plugin already writes and renders the editorial picture as Number, Pie, Bar and Area cards.

Status mix becomes a slice, template usage becomes a bar and cadence becomes a curve. The data is already in WordPress, the chart layer turns the authoring tool into an operational dashboard.